A corpora



' E. SCHUMACHER.

PULLEY.

APPLICATION FILED MAY l0. 1915- L1 941,553.

Patented Aug. 15, 1916.

rar nitro.

E1?ERTI-IAIEtlDl SCIIUMACI-IER, OE PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE AMERICAN PULLEY COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORA- TION OF PENNSYLVANIA.

PULLEY.

Specification of Letters Patent.

Patented Aug. 15, 1916..

Application filed May 10, 1915. Serial No. 267,928.

To all 'whom t may concern:

Be it known that I, EBERHARD SCHU- MAci-inn, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Pulleys, whereof the following is a specification, reference being had to the accompanying drawings.'

Broadly speaking, my invention relates to so-called split pulleys of the type which arel provided with what may be considered a single diametrical spoke, said spoke, 1n

itself, being a two-part element, one part ofv 4represents a view, partly in side elevation and partly in vertical section at right angles to the pulley axis, of a complete diametrical clamping-spoke pulley embodying my invention. Fig. II, is an axial section on the line II, II, of Fig. I. Figs. III, IV, andV, are respectively an edge view, an end view, and an inverted plan view of the element whose combination with the other parts constitutes the essential feature of the present invention. Fig. VI,'is a transverse sectional view of said element on the line VI, VI of Fig. III. i

As the respective halves of the pulley are similar in construction (thepposition of certain structural features being simply reversed), the parts of only one half portion will be described in detail, those parts-which are comprised in one half portion being indicated by numerals less than one hundred, and the corresponding parts in the other half being indicated by similar numerals raised by 100. Thus, for instance, the hub-shell marked 6, in one half portion, is marked 106 in the other half portion.

Referring now particularly to Figs. I, and.

6, indicates the segmental hub-shell to which the clamping spoke member is attached as hereinafter set forth. Said clamping-spoke member comprises a central. arched portion 8, integral with two straight end portions 9, and 10, respectively, which latter are secured to the pulley rim by riveting the inwardly bent ends 11, and 12, respectively, to the inner surface of the band 2, at the regions adjacent to the extremities of the semicircular rim. The clamping-spoke has an arched cross section, substantially that characteristic of the device set forth in said Iletters Patent No. 1,125,643, but modified as follows: Referring to the lower half pulley shown in Fig. I (where the sectional illustration best indicates the feature) it will be seen that straight portions 109, and 110, and the sides of the arched,y central portion 108, are inwardly dished so as to present plane surfaces 113, and 114 (extending longitudinally along said straight portions), and plane surfaces 115, and 116, extending along the sides of said arched central portion 1,08, at, an angle to the surfaces 113, and 114. The inclination of the plane surfaces 115, and 116, to one another is approximately at an angle of 90 degrees.

It will be noted that the dished portions do not extend to the central portion of the arch 10S, but are limited to the sides thereof and to the straight parts 109, and 110, and it will also be noted that said dished portions do not extend entirely across the width ofthe clamping-spoke, butthat each dished part constitutes a depression, having along its sides what may be considered as raised fillets 117, and 11S. Returning now to the upper portion of Fig. I, the construction just described is'indicated by the dotted lines, the fillets 17, andV 18, being shown .in full lines. v

The clamping-spoke is preferably provided with vlaterally projecting flanges 20,

and 21 (see Fig. II) whereby it may be secured to the hub shell by rivets, such as 22, 23, 24, etc. The meeting edges of the inwardly bent ends of the clamping-spokes are provided with registering projections and recesses as indicated by the dotted lines at 25., in Fig. II.

The dished straight portions of the clamping-spokes are perforated to receive the which for convenience, I term an arched stay-band. This consists of a fiat band of sheet metal, such as steel, having the configuration shown in Figs. III, IV, and V, that is to say, it comprises a central arched portion 40, having substantially the same curvature as that of the pulley rim 1, and of a width adapted to lit snugly between the internal edges of the fillets 3 and 4, as shown in Fig. II. The arc subtended by this cenmately radial to the arc of the arched tral portion 40, is preferably about fortyeight degrees. At each end of the arched portion 40, the band is sharply bent into planes 41, and 42, respectively, and is tapered inwardly, as shown in Figs. II, IV, and V, so as tov ultimately reduce the portionsv 41, and 42, to a width corresponding to that of the dished portions of the clamping-spoke, z'. e., the width of the interspace between the fillets 17, and 18, or 117, and 118. rIhe plane portions 41, and 42, are approxi- P01- tion 40, and extend inwardly for a distance corresponding to that between the inner surface of the pulley rim and the highest extremity of the inclined dished portions 15, and 16, on the sides of the arch 8. At these points, the vband is again bent and continues in plane portions 43, and 44 which extend at an angle corresponding to the angle of v inclination of the dished portions 15, and

16, so as to fit firmly thereon. One of these plane portions, indicated at 43, terminates at a pointcorresponding to the lower extremity of the dished portion 16, upon that side of the arch 8. The other plane portion 44, is preferablyprolonged and bent back upon itself as indicated at 45, and 46, the locally wider edges of the band at this region being bent inward as indicated at 47, and 48, so as to form a rectangular cup adapted to receive the square nut 31, of the screw-bolt 29, and hold said nut against rotation. The bottom of the cup is perforated at 49, to permit the passage of the threaded end of the screw-bolt, and the pulley rim is perforated at 60, to permit access to the head of said bolt. The arched stay-band is secured to the clamping-spolre, preferably by means of rivets, such as 150, 151, seated in the dished portions 115, 116.

When the arched 'stay-band, constructed as above described, is combined with the pulley members proper, having the struc- 1 tural features above set forth, the general stiffness l,and symmetry of the pulley are enhanced, and its proper appllcation to a shaft without distortion is insured. Furthermore,

the stay-band in its fullest embodiment is useful in facilitatingv assemblage of the parts.

Having thus described my invention, I desire to note that while in its preferred form I contemplate the extension of the dished portion of the clamping-spoke along the straight parts thereof, as well as at the inclined sides of the arched portion, I do not limit my broader claim to such detail, and further that the invention is not limited to the feature of extending'the stay-band at one extremity so as to constitute a retaining cup for the bolt nut. Furthermore, I do not wish to be understood as claiming those structural features above described which relate to the clamping-spoke itself, since my invention resides in a combination of which the clamping-spoke is simply an element.

I claim:

1. In a two-part diametrical-spoke pulley, the combination, in each part, with the pulley rim, the hub-shell and the diametrical clamping-spoke; of a stay-band integrally comprising two substantially radial plane portions, an arched intermediate portion conforming to the interior configuration of the pulley rim, and divergent seating portions at the inner extremities of said radial portions, said divergent seating portions conforming to the adjacent configuration of the clamping-spoke; means for securing said stay-band to said clamping-spoke; and means for securing the two parts of the pulley together, substantially as set forth.

2. In a two-part diametrical-spoke pulley, the combination, in each part, with the pulley rim and with the clamping-spoke having straight end portions connected by an intermediate arched portion and provided with inclined dished portions at the sides of the arched portion; of a stay-band integrally comprising a central arched portion having a curvature conforming to the interior curvature of the pulley rim, two radial portions extending inwardly from said arched portions, and divergent seating portions at the inner extremities of said radial portions, said seating portions conforming to the inclined dished portions of the clampingspoke, and means for securing said stayband to said clamping-spoke; and means for securing the two parts of the pulley together.

3. In a two-part diametrical-spoke pulley, the combination, in each part, with the pulley rim and the clamping-spoke having straight end portions connected by an intermediate arched portion and provided with inclined dished portions extending along-.the sides of the arched portion and prolonged into the straight end portions; of a stayband integrally comprising a. central arched portion having a curvature conforming to the inner curvature of the pulley rim, two

lllllllllllllllluww radial portions extending inwardly from said arched portion, and divergent seating portions at the extremities of said radial portions, said seating portions Conforming to the inclined dished portions of the clamping-spoke, and one of said seating portions being extended into the dished portion of the straight part of the clamping-spoke; a Cup formed integrally With said prolonged portion of the stay-hand; and a screw-bolt 10 having a nut fitting in said cup.

In testimony whereof, I have hereunto signed my name at Philadelphia, Pennsylvania, this fifth day of May 1915.

EBERHARD SCHUMACHER.

Witnesses:

RUSSELL H. BOWEN, GEORGE W. Tori-IAM.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, '.D. C. 

